[vortex-bug] transfer errors with 3C905C-TX-M
Mon, 4 Sep 2000 16:26:38 +0200 (CEST)
On Mon, 4 Sep 2000, Giuseppe Ciaccio wrote:
> Sergei was talking about file corruption in FTP transfers! This cannot
> depend upon the device driver: TCP/IP has well known error detection
> mechanisms, as it must provide error-free communication.
> If the reported problem is real and reproducible, it would imply a flaw in
> the protocol...
The 3Com cards (or at least some of them) provide hardware checksumming
for IP, UDP and TCP. The 3c59x driver uses them (look around the end of
boomerang_rx()) and signals the upper levels that further checksumming is
unnecessary. If there is a hardware bug, it will go unnoticed.
(I don't have at hand 3Com's driver, so I cannot check if they also use it
Actually, talking about hardware bugs, memory problems might cause the
same data corruption. Can you try to run some memory tests ? Running
Windows on the same computer is NOT a good indication.
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